micro actuator based on FPGA

 

 

YANG Li li1, GUO Liang1

 

(Faculty of Mechanical Engineering and Automation, Zhejiang Sci Tech University, Hangzhou 310018, China)

 

 

Abstract: Aiming at the problem of real time and precise control of magnetic levitation micro actuator, the structure and the principle of the novel magnetic levitation micro actuator with moving windings were researched. Based on the analytical model magnetic field distribution derived by using the equivalent surface current method, a suspension control model based on FPGA was proposed. The dynamic model of the magnetic levitation system was built. Then, a control system using PID control strategy was constructed, and the dynamic and stability performances were verified by simulation experiments. The hardware control circuit of the system was built and the software design was also programmed. The FPGA based experimental system of the magnetic levitation micro actuator was constructed finally. Levitation status of the mover can be tested by the odd current sensors, and the information can be collected and illustrated by the PC via Delphi interface. The experiment results indicate that the control system can realize high precision position with high respond speed and good tracking performance. The system is able to achieve a precision control of 1μm in the range of 2mm.

 

Key words: magnetic levitation; AD7671; FPGA; PID; kalman filtering